// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_
#define UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_

#include <windows.h>

#include "base/logging.h"
#include "base/macros.h"

namespace gfx {

// Helper class for setting and restore the map mode on a DC.
class ScopedSetMapMode {
public:
    ScopedSetMapMode(HDC hdc, int map_mode)
        : hdc_(hdc)
        , old_map_mode_(SetMapMode(hdc, map_mode))
    {
        DCHECK(hdc_);
        DCHECK_NE(map_mode, 0);
        DCHECK_NE(old_map_mode_, 0);
    }

    ~ScopedSetMapMode()
    {
        const int mode = SetMapMode(hdc_, old_map_mode_);
        DCHECK_NE(mode, 0);
    }

private:
    HDC hdc_;
    int old_map_mode_;

    DISALLOW_COPY_AND_ASSIGN(ScopedSetMapMode);
};

} // namespace gfx

#endif // UI_GFX_WIN_SCOPED_SET_MAP_MODE_H_
